SOLUTION: find x-cordinates f(x)=-2x^2+2x+9

Question 263731: find x-cordinates
f(x)=-2x^2+2x+9
Answer by JBarnum(2146) (Show Source): You can put this solution on YOUR website!
first divide all by 2 then do as follows

Solved by pluggable solver: SOLVE quadratic equation with variable

Quadratic equation (in our case ) has the following solutons:

For these solutions to exist, the discriminant should not be a negative number.

First, we need to compute the discriminant : .

The discriminant -17 is less than zero. That means that there are no solutions among real numbers.

If you are a student of advanced school algebra and are aware about imaginary numbers, read on.

In the field of imaginary numbers, the square root of -17 is + or - .

The solution is

Here's your graph:

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